[quote=@PharaohAtem]
Fist of all if he did create a time remnant like flash in most examples when they meet they would both implode Flash is a comic character and they break the laws of physics all the time unless you can explain how Flash can run Minh time the speed of light that example is null and void and second their is a simple explanation he would go back to farther a child so that child could grow up and help the gods free him from his prison that's just of the top of my head.

On the other hand he could do it to help kill Zeus for example he gets free joins the battle against Zeus but Zeus is still winning so he goes back in time to father a child with the hope he will grow up and help him kill Zeus since in one respect demigods are stronger then gods since in Percy Jackson they can steal the power of gods like with the lightning bolt.
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Obviously not exactly like the Flash cause talk about leaps of logic and breaking the laws of physics. Be that as it may there is nothing in the laws of time travel that prevent either the change of history or interaction with your past self beyond what a handful of science fiction writers have established to justify their storylines. If he has complete control over time as you seem to indicate there is no reason why he couldn't essentially alter any event in history that did not turn out the way he wanted. From that it could be assumed that he can manipulate time but not to the extent of actual time travel as most people understand it.

That aside that's a seriously risky move on his part as imbuing a mortal child with high titan abilities makes them extremely powerful and he has no means of guaranteeing they will join the war on his side. He could just as easily be delivering a powerful weapon into the hands of Zeus. And that example is also null and void because it deals with a specific authors interpretations of Greek myth and not Greek myth itself.